a (-1; 6)
b (5; -3)
c = 2a + b
c = 2*(-1; 6) + (5; -3) = (-2; 12) + (5; -3) = (3; 9)
=> c(3; 9)
|c| = √(3^2 + 9^2) = √(9 + 81) = √90 = 3√10
ответ: c(3; 9), 3√10
a (-1; 6)
b (5; -3)
c = 2a + b
c = 2*(-1; 6) + (5; -3) = (-2; 12) + (5; -3) = (3; 9)
=> c(3; 9)
|c| = √(3^2 + 9^2) = √(9 + 81) = √90 = 3√10
ответ: c(3; 9), 3√10